Apple, pear rot disease, also known as string wet skin, rotten skin disease, is a destructive disease that harms apples and pears. The disease mainly damages the trunk and main branches of the resulting tree and also harms the branchlets, young shoots, and fruits. In particular, pear trees have seen a clear upward trend in recent years in this area. According to the survey, the rate of diseased orchard disease has reached 70%. The yellow leaves of the diseased leaves are small and grow weak. Many trees of the fruit growers have also died of the disease because they cannot cure the disease. Take Yuan Zuochen, a fruit farmer and former Luozhuang Village in Gudai County, Weixian County as an example. Laoyuan currently has 20 acres of 5 acre trees and 150 trees, which have not been cured due to rot disease. Now 7 trees have been killed. Nearly 20 trees are still in serious condition. Critical condition.
The author believes there are several reasons for the serious rot disease. The first is that some orchards are due to insufficient fertilization, resulting in a weaker tree vigor or a less scientific application of N, P, and K (2:1:2), partial application of nitrogen, phosphate fertilizer, and potash fertilizer. Few or even scarce, resulting in a serious malnutrition, so that soil compaction, soil permeability is destroyed, resulting in increased soil and rot diseases. Some other farmers have excessively applied ammonium bicarbonate, which is considered to be less costly, or directly applied unfermented and degraded straw, as well as human and animal manure, all of which directly or indirectly cause burning of roots, roots, and rot. This has exacerbated the problem. The occurrence of the disease. Coupled with the favourable price of fruit in recent years, the price has soared. Some growers have applied bulking agents, resulting in excessive tree load and reduced resistance to disease. The use of swelling agents year after year will over-consumption of tree nutrients.
To prevent and cure fruit rot, in addition to scientifically increasing fertility and strengthening the trees, as well as effectively removing bacteria, re-skin scraping, and spraying highly effective fungicides, effective measures must be taken to eliminate rot. In addition to governance effects. Based on past experience, the author believes that the following methods for removing the disease are more cost-effective.
1. Peracetic acid smearing method: Mix 21% peroxyacetic acid and water 1:1, smear on the basis of heavy scraping or light scraping in autumn or early spring, and then close with yellow mud, wrapped with plastic sheeting. live. Generally smear 1-2 times to cure.
2. Humic acid fertilizer copper coating method: Take 35% copper chloride and copper and water according to the ratio of 1:10 after mixing liquid, the method above.
3. "Jin Bilai" brand vitality Tubao smear: Apply 38% Vitality Tubao liquid, smear on the basis of scraping the diseased skin, not only has good effect on fruit tree rot disease, but also can be applied to fruit trees to cut mouth Instead of sealant.
4. If the fruit tree is found to have yellow leaves, lobules, roots and roots, 55% Eurasian 500g (or 1250ml of 40% gold potassium) + 21% peracetic acid 100ml + 15kg water Liquid hole pouring (uniformly digging 30 in the canopy projection range, depth 5-6 cm), water infiltration after covering the soil.
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